Cable and line Testing Instrument
LQHV-500 Cable Fault Locator System
Professional Underground Cable Fault Detection
The LQHV-500 represents the next generation of portable cable fault testers, combining flashover detection, path tracing, and precise location capabilities in one integrated system. Engineered for field technicians, this unit delivers military-grade precision for power utility maintenance and industrial cable testing.
Product Parameters
Technical parameters
The longest testing distance | 15km (100km for the open-wire line) |
Testing .dead zone | 1m |
Resolution of reading | 1m |
Power dissipation | 5VA |
environment temperature | 0℃~+40℃ |
terminal temperature | -10℃~+50℃ |
relative humility | 20-90%RH |
Dimension | 275×220×160mm3 |
Weigh | 1.8kg |
Pathfinders
operation mode | Output - fixed frequency intermittent square wave signal |
Output Power | Pomax≥100W |
Output impedance | 1Ω-∞ |
Output signal frequency | 16kHz |
Output signal amplitude | 15V-340V |
Pathfinder transmitter power supply | AC220V±10℅ |
Fault locator
Rough measurement error | Less than 10% |
Fixed-point error | <±10cm |
Electromagnetic channel gain | >110dB (300,000 times) |
Electromagnetic channel receiver sensitivity | <5μV |
Sound channel audio amplifier gain | <120dB (1 million times when the signal-to-noise ratio is 4:1) |
50Hz Power frequency rejection | >40dB (100 times) |
Power consumption | <120mA (0.7W) |
Buried depth detection | >≦3m |
Comprehensive Fault Detection Capabilities
Identifies all common cable faults including:
Low/high resistance faults
Short circuits & open circuits
Insulation leakage
Flashover faults
Sheath damage
Advanced Technology Features
Dual Detection Modes
Combines low-voltage pulse method and high-voltage flashover method for complete fault spectrum analysis
Intelligent Signal Processing
Quartz crystal oscillator with DSP chip ensures stable waveforms even in noisy environments
Adaptive Cable Matching
Automatically adjusts wave propagation speed based on cable type (XLPE/PVC/paper insulation)
Field-Proven Reliability
Military-grade imported components with <0.1% static drift
IP54 rated enclosure for harsh environments
Complete circuit protection (overvoltage/overcurrent/surge)
3-year warranty on core components
Complete Test Kit Includes
Main detection unit
T-type electromagnetic probe
A-frame ground fault locator
Noise-canceling headphones
Professional carrying case
Industry Applications
Ideal for:
Power utility maintenance teams
Industrial plant electrical departments
Telecommunication cable networks
Railway power systems
Oil & gas pipeline cathodic protection